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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b44593bd5cfacc27b337aa62694326fe886e4bec01e3485008b22ccf035574' 
  AND token = '4NjCn8yBWgVMcasxA2JLoE9N9lLKXvFM1kkUbnI4A2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}